Meaning

noun the act of moving forward suddenly

noun (fencing) an attacking thrust made with one foot forward and the back leg straight and with the sword arm outstretched forward

verb make a thrusting forward movement

originFrom French allonge, from Old French alonge, from alongier, from Vulgar Latin *allongare, from ad + Late Latin longare, from Latin longus. Doublet of allonge.

Etymology from Wiktionary, CC BY-SA 3.0